docs: def find_dependencies_with_parent(self, dependent, parent):
          """Find all dependencies of the given revision caused by the
          given parent commit.  This will be called multiple times for
          merge commits which have multiple parents.
          """
          self.logger.info("    Finding dependencies of %s via parent %s" %
                            (dependent.hex[:8], parent.hex[:8]))
          diff = self.repo.diff(parent, dependent,
                                context_lines=self.options.context_lines)
          for patch in diff:
              path = patch.delta.old_file.path
              self.logger.info("      Examining hunks in %s" % path)
              for hunk in patch.hunks:
                  self.blame_diff_hunk(dependent, parent, path, hunk)